Cummins/Onan — Producing Voltage Build-up - Method J
Operation · Magneciter
From a Cummins/Onan service manual covering: 02SX1N1A, 04SX1N, 04SX1N1A, 04SX1N1B, 04SX1N2B, 04SX1N3B, 04SX1N4B, 06SX1N, 06SX1N1A, 06SX1N1B, 06SX1N2B, 06SX1N3B…. Check it applies to your exact model before use.
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Before you start
- Have set running but be cautious!
Procedure
- Short out gate reactor(s) to temporarily remove resistance and apply full residual voltage to alternator field.
- Refer to diagrams to locate terminal points for jumper connections.
- For 04SX and 06SX press residual reset switch in Magneciter.
- Exception for Spec A: place jumper joining G1-G2-E2.
- For 07SX, 102SX, and 2SX, jumper E2 to heat sink of rectifier No. 1.
- Remove jumper wires when AC voltage starts to build up.
Tools required
- jumper wires Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.